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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ef2158bc9525a83258a7f4e67f5c7f77d83a40d38ca7e4eb4543fe7fb7881086' 
  AND token = '8NEAYri62hUSBy8DikYuhyvB/h39j0LWkc+BV4mKX7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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