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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'be8b3ff042439beff27aec0e6f75c1f4391399c86c82e496a5240b0bae5da331' 
  AND token = 'WWywWPfAi1v6sqQvhZqjtOfq4MK4qBQ5ckHj14ZEqF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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