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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5d62a20c0ec8d3f269e25a5a1deca96efee601b65b1f894b151dcdeea1b14f0b' 
  AND token = 'LdJ0cQDrVCj7nV7LVtbFlI7g/DmxXRl1Zg5SQrHXTOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}