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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8a31456ea6368d4c62d3bd01e7ea0904f1d3c05efe26c0d53bd352c7d662c240' 
  AND token = 'gq5pHcYZ5K6pX+2ZJ8pOZkSpL4rTwiGCq4IzyZyBmpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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