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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1086389975fd1daaf9afe506d412b59a236abc769bd0955d57ae84f35eaa6fc5' 
  AND token = 'cF1zsGm903YhNoXayoND41tpEo9gLuPjpH8wyqvQCf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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