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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '619592e9467a758ab23833383a22110aec55c6d7255a743522915c020a1024a5' 
  AND token = 'BGIduDwewPkLhnQ+YDbwaRUZhwWOuakze552y0j8bMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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