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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '054af566b5c626000d4f6232a7e4caa12d2d839963b6c2ce0f6681cc8b6dcaae' 
  AND token = '6bg9g+6fycQpFVU03ACi1c5UIdGHWUEcbZiGxB7XG1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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