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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c6a58e611d0b45b2c14435e68e84146438bb87ed5fb31521cebb32a31c06e45e' 
  AND token = 'gj48ccN4eWF4U2zQaoF9qdLz3O3ZzAWSKXYxPEat6vc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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