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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e89bdbbc4dbbe773becd938c30b40e441bb9a66a8d4a49b981ee4785bec5419f' 
  AND token = 'gM2Rqr0XB0unsiC6/xoOpYq9P8VmWzdHyhYkwBswThQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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