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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7a4280f96f6479c0404af3f23c3b6fd2b6bec14dfba610294df435d51d4ef939' 
  AND token = 'TGHNdACL97RRLdoBIXYazqoa1UD+LevlXoMdNq9TCfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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