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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '80b0db4650481d92234f13b0e6533ad9cfbb8039b50afef660a34846c286a655' 
  AND token = '3a+kN3fZ9UyrJEcHbF499bOhSbiA9ighl5OwwaC/HpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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