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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'be7e35da6e7c4155301a726febd724becdb1dd28b55aaf055562fde699eae71a' 
  AND token = 'pivYAgcLLg2dp6fDxUMuIl0I2frMgq5P/uG4HdI/kcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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