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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c777c23c8668959eac760ffaf08fce47cf1c488ef372a56c464654d5956d8dd0' 
  AND token = 'L5mO4MZ7ApJh6as/J7327yMEYuRFCyeUXmzJRv4wEmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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