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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '50511e161459651e97024cc51f3715af4e231c7e6b335318f0cdfff710f3aa6e' 
  AND token = 'vc/11O8dMfhq2G9fh4Qv7aBpT7dzg7OGUDMnlEni6B0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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