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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1e2586575ecc35d972ab5108d65cfd0c735533714910594686d85d38297ff4c5' 
  AND token = 'BRIov7qECEfeK8Yh+eufDp4kFZSRPXSkXt3J1TQcQMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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