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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '85c35e66dd461b2b8db7adba11f90f5774d9451529e68fac4dca0d80b9b64388' 
  AND token = 'wVo7KUonrVW6FZQLbU5prt0pVCtMKPh0IqY1cdV1Wic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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