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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2a19bdac28c05cfa96b27b5ccbf9a95de15a0848816e16ecb5c2963e3c55cfd5' 
  AND token = '2Z2tDLLFzRimpZCK3u0OPhDeFbFE6kaLAcYPND4xW+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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