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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f251a70847edd907b0f818e7b5529e51ecf58f8ed4b9716b80ce3fa180bd4fd1' 
  AND token = 'rhiiRjEkpQCQUa1RbT3WuIqZWgE8HRfAGN4/uEV8BZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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