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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1b13abd33eb8be668b817ded9c46458b01ce4cccaaf46d9a1e5862402b40e5f7' 
  AND token = '6OaQNxhMC8AIjMJN2qCjCd+e+K+r2CFR4aNggagXWpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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