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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'de5a32b2c8bcf32f3eb0c7dcb7027037bea88f18068077ae40206eb6c4724886' 
  AND token = 'fRQPPojN392d8x4pHHueK6Co9s0wzVfrcBNGzsTqXyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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