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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9873951620c262fc8cf8681b6f1c37852d6b4b1c641b625675e18831a3e2491a' 
  AND token = 'lg2voTvAxbGTcsHeCwGp5E5Jdg+9meIoy94IwdtxQ7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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