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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3c9a9aef5352afc71368529156d9bbafb516bc9bcc67622f6752fd8d69f214ca' 
  AND token = '/bqvYd+X10O9eE1R0om+QNQfCD/xSIpCty4ZYCyTC1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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