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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1a83aec39d4472b49aae3ef4177deb6e201968548b1a4867f47fcff14ca4009c' 
  AND token = 'QvChjAqonlG3Al0MNuAvfeQ5jsJaU29/H2WFNnxY9/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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