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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f7324e6affedee77bbcf671458a9d269efc90676685a8cc4586381d96433cbee' 
  AND token = '03NMJ/p/enYfTKMOnZ1Ctx1AGLm1Bc6JCCeUBzZBMV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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