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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1f34b4ff44b5c7ad59c8cfa55a993e66d98682781d5c3c14e1a34ad2c8453df1' 
  AND token = '6BMSVN9k4LCN9COJV/juonMcQoSFRoBxjrusAup3LTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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