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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0039dbb05cf678f4f9af3aaa164e5929b1ff6f54a9a5e7f6f56890ff3eb5dced' 
  AND token = 'oJGr7fD94EY/gX6+3JP2BL7D1vs0Jc5SSdV+hOWJ9vQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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