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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '28c06d32c21cd7e0edfc4c13628acf721a91af9ca42ff21fdc9f4cbb0dafad22' 
  AND token = 'F0Ox6UroPKoVZeD+2mfoYmEhu1CIsxOMfxOtO/SjKrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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