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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cac8d0476048d8423f68b210e55356a34c4bcf16606620e316be629c748dd184' 
  AND token = '4S0vaASUiGBCQSJaT+fJYUCvTLNovlRIsaXhxZp0E4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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