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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c6338595e80c51d00841f8169cf3c11d538d204015b7e7c4bf5345bd91237fd8' 
  AND token = 'Qg+tuO6Ak+d1tgEaSCuDXwDDFzrA8ej9fNLx5KBHJyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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