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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '45c5fda2b7a62d00c134a8e00d7d3226adb1c648fff0fc4fa06fbd2405179e7c' 
  AND token = 'jThgPlS7Jh87HdjcDX+OcnfHbFmiIpjS6n1I7+/hqMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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