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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '555eae32c38a3696ff46ea80f18fefd8e46186b6d501a8f291be6918075f59b6' 
  AND token = '/TfBdZl8R7Ss+eY0IbQqRtYTEm5uyXuMqigwgLqJsyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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