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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7ac7b64c0de571646266461a8e429600d1f41b4f39572b8c57bff3e6a76103d7' 
  AND token = 'tU0p69s2VLA8xiJtR63Jyx/zl9EF5J1wfgGaW52G3NE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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