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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0f7f6349a7c76fd8960d8d5a9f0ef07d7c848f8426197beda174f3a83b806a2d' 
  AND token = '8Atx2dHtBiwJJeQO3JB74oM1B7Ri8lYXBrH+/3xgYVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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