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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2971136c8ab244aecf284b9f0ee023bfc5cb5b246f3ad9116e632bec6379cc9b' 
  AND token = 'vkuL2UrAjWK2/gs+if22TvGGuXMd7uMCAHJIc5HGEeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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