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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cde7d5eaa7d2ac5dd14cc7e28cca16744c9957ff1129a55a5c9e83d0e7476c10' 
  AND token = 'DLHj8hkQB6KW5ETewBWX/rEz47h0wRTi1HnVOcTLpHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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