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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3beb6e7d4ff36a220878fa12cd92a202cacdf7ebe46ecaff076aa34d402d6284' 
  AND token = '5leDi3jZXjqc0m2gAIRZnAxQJE3zVVl7J167ILshezI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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