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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '91053ae7c448e0a27a38da2010ffd93bb115069cae5b0cccb02eb5c4643369f8' 
  AND token = 'fpe6To+WAwf0I+zdluYwUlSt/hMXNMAWqZwX4EWT9yE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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