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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0d8b73e46f56644e351d99cbeaa612f1b80437e58301939384e098b8a8a41d70' 
  AND token = 'd8hnXc/Y/o/GWYfRPrzMQMC7aIkq2CUHI1JcOXH2oPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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