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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5ac670c047d6a22c255a695130953ae28d0941dd5db1930552dbff141ad2c3be' 
  AND token = 'BA7eQ7rZ6s9cNeFUZJZEq08Y6h48apErAdUfvp30Gks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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