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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '31ed69b534962229c77860295758e26d605f6036edc0fe027a61e15b47d8844b' 
  AND token = 'OsIBs1u1giADVAvDFMiEAmsEK6r9Lz+y1i6camYgTQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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