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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c83a9d00a7b76dbb688f6b9f400bc43eec931b6db6ecef20f2db4d4817ff9c58' 
  AND token = '6/7tyvkj067HdQmBlcstuifBbOn36jyJ8wXzt/519bE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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