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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b2a65cbcd48f7f7872f24b1c6e8fd99a6f01f004c778df376d36fcd5caa6e4d9' 
  AND token = 'zGEvD3r5Y0Oo8vM94xFmvAznfsu9sOnpSC+roDtjCMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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