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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ae7c06749ab9b61216261cae8a14fb5758755c5b3202f567a93d37ba8cfff9e7' 
  AND token = 'ur9TeZDk8kWD8D2BOQSuBEqHz0eGaymuP3+yIL1pnJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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