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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a93c5e3e1b0cb60c73325bcaf3511d1721c5c5a0238aeeb3acade76f1c8118ee' 
  AND token = 'jEjR92hWfMJvRQON4uXuvdvvh4K5b8iWMi6bLRVRgjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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