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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e9dadb52a9ce8ca0086f9030d0a9852cd18b3c8ffb88d8e4681e688dd32fadcf' 
  AND token = 'Kbe0fZKmyy+NKd+GisGBXdfUKB4XyMuveAPWQ2bKNG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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