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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aa817e20a00aa08249daf77cbab5ebaa3456f46c575e8f48f6f5312efaf645bc' 
  AND token = 'B2MD5H9LHCyofpZIaCnYATGl7otMSPURJGewu/N7J8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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