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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7e99f5b8510e5ee07fdfbfcaf1ae2e1b9ddd77f2638f51689d3f270a8aafd437' 
  AND token = 'rNHx1Yt3/EErgrozDB2E1U/r1whomA77IARYqXF7peI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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