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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a2fe70106132fae9a1762f152a43c009ed0694d8de70d448db17cd4442efda23' 
  AND token = '/MjBxqNDybY9lXLiVFHVk986WNYi17bUPTw3KRiAok0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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