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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c9f2000d64e34bc6a59f470040b7a13f3fcfd61d16e099d2237f4ce1c00f577d' 
  AND token = 'TiXHyBBLq3byRfvGMbu48EvxrXhDRB6Pz6pW/7TNgOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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