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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'efb2da51177123cf584e6f7d794bcbce3994c77f6a7d9aed3eb5573633f98457' 
  AND token = 'wGoX+DMDiNEMHdChkLfMWjxAE3bIYCF/Yy+h7WFhAPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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