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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7062f322b434eb74ae397ddfe636f07ecc50c0ca65783aa85ff936f5779f47fa' 
  AND token = 'SsQ0wCBEYwzW7DszxTpw2O+MnJlrp90GU554pZAcNZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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