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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7f15c1c4a53c63b4749ed440e546f42ec9e8b3a5c2bc6ddd8b56d2d31de9a849' 
  AND token = 'Gywmo8mGNmj7ExymLit4CCRqdjszc8QY6Jr608Dq5/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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