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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '76451d9ffb0fdc5b4554b418f5cfbb8d82980c707f7e08d38bdf0877505d6858' 
  AND token = 'IA3T6Sm3bJf3Ou6pMU1nj9aBg7kKZDZD0J5QCemeXLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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