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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2fd510997cd3db2b04d2468d3e5212b2619f2fdcbdf579bc808d42f17add786a' 
  AND token = 'OIg5sKBkVH+dIfVDg1TeEUCHhTh864kz7cA0jLtXf8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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