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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b01c0d4d97e5c68ac203d3b4a74d9f9ea43807f8fc2ffbd58b19402cdb0de5ef' 
  AND token = 'v6FCgCrP75ReoZ7e/f8IstZx5yuiAYBp5e95nWr3q78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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