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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ca1bdf06d8a57f07f6a2a48202793928f4a762fa3ddee43bc275f9035ba1615c' 
  AND token = 'zThWMFeMWtXNzQk+BH0O+1PmRZ4C7beNdISTp2BqPbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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