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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b46a3e50ffe46e8ed0eced3e355a1378cfacc01540f926c40dc85c25045faf6e' 
  AND token = 'EK9bZo4CT/Swtw3bwxlwsxbtNAIhgNfj4dkUzDH2n3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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