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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '467d291189a3fc1adf0206abebdc83b57ac362ea514def5a891c3e2d5fae8b24' 
  AND token = 'eD9gOMTplRxLqLTLPjlo06mv8IRoHUP0qCEu1SVbCDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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